Rung lock



Jan. 26, 1954 w. E. LOCKETT 2,666,966

RUNG LOCK Filed Nov. 23, 1948 INVEN TOR WaHerE. LocKeH JZWM/ ATTORNEY Patented Jan. 26, 1954 UNITED STATES PATENT OFFICE RUNG LOCK Walter E. Lockett, Timmins, Ontario, Canada Application November 23, 1948, Serial No. 61,533

1 Claim. 1

This invention relates to wood joint fasteners and more particularly to a rung lock.

Quite frequently, tench and mortise joints in furniture come apart, due to the dryness of the air in winter months, particularly where a hot water system is used and no provision made for humidifying the air.

My invention provides a safety measure against these joints coming apart even after the glue has dried.

The primary object of the invention is therefore to provide a novel fastener for tenon and mortise construction which will 'hold the two elements together against accidental displacement even when the glue is dry and broken.

Another object is to produce a practically inseparable joint for two members of wood and this, through the means of efficient and cheaply constructed fasteners.

With these and other objects in view that may appear while the description proceeds the invention consists in the novel arrangement and construction of the two parts as hereinafter more specifically set forth, claimed and shown in the accompanying drawing forming part of this application and in which:

Fig. 1 is a sectional elevational view of the two members in the assembled position;

Fig. 2 is a sectional elevational view of the lower member;

Fig. 3 is a view similar to Fig. 2 of the upper member;

Fig. 4 is a plan view of the upper member and Fig. 5 is an assembled view, partly in section of a tenon and mortise joint.

Referring more in detail to the drawing in which similar reference characters designate corresponding parts throughout the several views it will be seen the invention consists of two metallic members which are constructed in such a manner as to be interlocked when assembled and means provided on both members for gripping the part with which they come in contact.

The lower member I is cone shaped and is formed with a plurality of sharp projections H on its underface while one of the extremities has its underface recessed at I2.

The upper member I3 is also formed with a plurality of sharp projections l4 upon its surface while the inner face I is concave to lit the contour of the lower member. At one of the extremities of the upper member I3 a hook I5 is formed by folding under the extremity of the 2 member. This hook engages in the recess i2 formed on the lowermember.

Figures 4 and 5 show the device as being intended for round dowels such as chairs, tables and the like.

Although it is true that most tenon and mortise troubles arise in round tenon and mortise joints it is nevertheless to be understood that the device may be adapted to be used on square tenon and mortise joints.

It is believed that the construction and ad vantages of the invention may be apparent from the foregoing paragraphs taken in conjunction with the accompanying drawings without further detailed description.

While the preferred embodiment of the invention has been disclosed it is understood that minor changes in the details of construction, combination and arrangement of cooperating parts may be resorted to within the scope of what is claimed without departing from the spirit of the invention.

I claim:

A tenon and mortise fastener comprising a pair of members disposed in superposed rela tion adapted to be driven between the tenon and mortise, the upper face of the lower member being cone-shaped in interfitting engagement with a correspondingly shaped concavity in the lower face of the upper member, the outer face of the upper member at one end being inclined downwardly towards the lower member and terminating in a reversely bent hook receiving one end of the lower member, the end of the upper member opposite the inclined end being formed with a fiat, relatively broad surface to facilitate driving of the fastener and teeth projecting from the outer faces of said members.

WALTER E. LOCKETT. 

